I have noticed a strange issue after we upgraded to akka 2.4.2 that appears
sporadically but once it rears its ugly head it basically causes the server
to consume a ton of CPU and we have to restart. This issue appears to be
with the smallest mailbox pool router. It gets hung up in peekNode in
AbstractNodeQueue, in that do/while loop:
protected final Node<T> peekNode() {
final Node<T> tail = ((Node<T>)Unsafe.instance.getObjectVolatile(
this, tailOffset));
Node<T> next = tail.next();
if (next == null && get() != tail) {
// if tail != head this is not going to change until producer
makes progress
// we can avoid reading the head and just spin on next until it
shows up
do {
next = tail.next();
} while (next == null);
}
return next;
}
I have attached a screenshot of the thread dump from jconsole. I'm still
in the early stages of debugging this, but would appreciate any info from
the akka team on this.
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